Never-before-heard tapes of Jacqueline Kennedy talking about the JFK assassination and her years in the White House will air in September in a primetime special, ABC announced yesterday.

The existence of the audio tapes, recorded in 1964, first became known last January when the History channel — which is partly owned by ABC — announced it was dropping a $25-million miniseries about the Kennedy family.

According to reports, Caroline Kennedy threatened not to cooperate with the tapes special if the warts-and-all miniseries aired.

ABC said yesterday that Caroline will participate in the special.

The recordings are a long conversation Jackie had with historian Arthur M. Schlesinger, Jr. shortly after JFK’s death. The late First Lady stipulated that they not be made public until after her death.